ROADSTAR LCD7114KL
Instrukcja Serwisowa

LCD-71114KL Service inspection Manual

Page 2 of 5

(2) Faulted Function£º Audio Sound (Screen Picture is normal) Not Checking Volume Level in Muting (Silent) Mode as below inspected process:

Start

YES Check if the main unit is in MUTE Mode NO
Check IC U13 (Pin-9 & Pin-16) which have audio output or not

Press the MUTE button of remote control YES

NO

Check Speaker, Soldering or J111 Cable may be damaged

Check IC U13 (Pin-5)

NO

+12V power supply or not

YES
Check power Check IC U13 (Pin-4 & Pin-6) audio signal input or not Check IC U12 near the NO components of circuitry supply circuitry

YES

Check IC U15(3\13) pin has audio signal output or not YES

NO

Check R132 and R136 and so on

Check IC U14 (Pin-50 & Pin-54) near the components of circuitry